Your calculations are off. This spell increases your weapon's AR by 7.5%. 15.45 is not 7.5% of 617, it's more like 2.5%. 617*0.075=46.275, so in your example it would add 46.275 AR. You can get a 20 AR buff starting from as little as 267 AR, and you'll pass the +40 AR mark on a weapon with 534 AR. The wiki is correct.

"The increased damage may seem very low, at 20 to 40 extra AR for a fully upgraded weapon, but also remember that this adds physical damage worth the equivalent to lots of point investments in strength or dex, especially after hitting 40 in either stat."

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People please the bugg is amazing especially as the guy below just stated and best for high AR weapon since it is a % change because basically adding a 20 to a straight sword is not as actually effective as adding an 80 for a UGS plus the heal is not bad people complain that it roughly heals 100 hp but consider it as extra total hp you need like 6 7 levels to get 100 extra hp at 40 Vit and for the love of god split damage is better than physical damage so this is the bad fact about this buff if i add 30 dmg to physical which is reduced by 20% or i add 30 dmg to elemental which is reduxed by 15% i'm better off taking elemental this is common for most melee armors as for armors with high elemental resistanxe these usually are weak physical armors so you dont need to buff your weapon dmg since they are already weak to physical think about effectiveness not kist efficiency

Since I have been asking myself this question for a while now and many of you might be asking the same question, which is better for a hp regen build this miracle or the blessed infusion? Here is my conclusion. Blessed weapon is better for a non faith dedicated build and using a heavy weapon like a greathammer or ultra greatsword with the %7.5 AR bonus. Blessed infusion is better for faith dedicated builds say around 30+ faith. Reason being that the blessed infusions scale much better with faith now and the AR isn't utter crap now. Another bonus of the blessed infusion is the fact you don't have to spend fp to buff it like blessed weapon. The blessed weapon also only lasts a depressing 45 seconds, 60 with lingering dragon crest ring. However blessed weapon is a very decent weapon buff. It does only add about 40-50 AR to a heavy weapon but you have to remember this isn't split damage so it only comes to about maybe 30% less damage than your typical buff, but you trade this for hp regen. This is why many people scoff at this buff because they don't get that massive AR bonus from other buffs. Not to mention the fashion souls is freakin amazing for the buff.

In conclusion: Want a hp regen build without heavy investment into faith? blessed weapon. Want a hp regen build with a weapon that will have decent AR on your 30+ faith build? Blessed Infusion.

Post patch 1.13, with low str and dex (18 or less) and 60 faith, the Blessed Gem infusion on an S Faith scaling weapon will be stronger than a heavy/sharp/refined/raw infusion buffed with the Blessed Weapon buff. Not by too much but overall it edges it out and pretty much makes Blessed Gems the better option for a faith build if you want to do a regen setup now,

Amazing weapon buff and horribly underrated by a lot of people. People will turn their nose when they see this buff being used but instantly start to panic when they see the person is a healer build. A great tool for those new to pvp as it helps you recover for some simply mistakes. Great for beginners and experienced players alike.